Internal temperature measurement and conductor temperature
According to the transient thermal circuit model of the XLPE power cable shown in Fig. 6, the conductor temperature
Power Temperature Measuring Optical Cable Model and Specification Table
COMEM and Fuzhou Yinuo offer fiber optic temperature measurement systems for power cables, with models supporting distributed sensing, high accuracy, and wide temperature ranges.
COMEM Fiber Optic Temperature Measurement Devices
| Model | Channels | Measuring Range | Accuracy | Sample Rate | Display | Analog Output | Relay | Interface | Fiber Diameter | Thermal Response | Connector |
|---|---|---|---|---|---|---|---|---|---|---|---|
| FOTEMP MN30 | 1 | -200°C to 300°C | ±0.2 K | 250 ms | No | No | No | TTL, RS232, RS485, USB | 200/220/240 µm | 20 K/s | ST |
| FOTEMP HD20 | 1 | -200°C to 300°C | ±0.2 K | 250 ms | 3.5" LCD | No | No | USB | 200/220/240 µm | 12 K/s | ST |
| FOTEMP MS10 | 1,2,4 | -200°C to 300°C | ±0.2 K | 250 ms | 0.96" OLED / 1.92" OLED | 0–10 V or 4–20 mA | 1 per channel | RS232, USB | 200/220/240 µm | 7 K/s | ST |
| FOTEMP C15 | 1,2,4 | -200°C to 300°C | ±0.2 K | 250 ms | No | 0–10 V or 4–20 mA | 1 per channel | RS485, USB | 200/220/240 µm | 19 K/s | ST |
| FOTEMP C20 | 1,2,4 | -200°C to 300°C | ±0.2 K | 250 ms | 2.8" LCD | 0–10 V or 4–20 mA | 1 per channel | RS485, USB | 200/220/240 µm | 3 K/s | ST |
| FOTEMP T20 | 2–16 | -200°C to 300°C | ±1 K | 250 ms | 4.3" LCD | 0–10 V or 4–20 mA | 2 programmable, 1 sensor fault, 1 watchdog | RS485, USB | 200/220/240 µm | – | ST |
| FOTEMP T30 | 2–16 | -200°C to 300°C | ±1 K | 250 ms | 7" LCD | 0–10 V or 4–20 mA | 16 free programmable relays | RS485, Ethernet | 200/220/240 µm | – | ST |
Key Features:
- Long-term temperature range: -200°C to +260°C, short-term up to +300°C
- Fiber coatings: Polyimide or PTFE
- Optional accessories: Nomex® J-Spacer or Disk-Spacer for mechanical protection
- Recalibration typically not required; calibration services available for cross-manufacturer fiber compatibility
Distributed Fiber Optic Temperature Measurement for Power Cables
Fuzhou Yinuo Technology provides distributed fiber optic systems for power cables based on Raman scattering, suitable for monitoring conductor, insulation, and shielding layers. Specifications and Features:
- Fully distributed sensing: Detects temperature along the entire fiber line in seconds
- Monitoring distance: Up to 30 km, customizable for longer distances
- Positioning accuracy: ±1 m
- Quick response: High sensitivity, short single-channel scanning time
- Electromagnetic immunity: Quartz fiber, electrically insulated, unaffected by EM interference
- Intrinsic safety: Optical signal power at microwatt level
- Alarm functions: Constant temperature, regional differential, rapid rise, fiber breakage, device abnormality
- Data visualization: Zoning maps, temperature distribution curves, historical trend analysis
- Installation: Flexible layout, easy analyzer setup, suitable for complex electrical environments These systems are widely used in power cable monitoring, switchgears, transformers, and industrial applications, ensuring safe operation by preventing overheating, insulation degradation, and potential fire hazards. Conclusion: For power temperature monitoring, COMEM FOTEMP devices provide modular, high-accuracy point measurements, while distributed systems like Fuzhou Yinuo's solution offer continuous, long-distance monitoring with precise localization and rapid response. Selection depends on the application scale, required accuracy, and installation environment.
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